Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Controllable Engine Mounts: Notes
The 4-cylinder engines are fitted with controllable engine mounts. The controllable engine mounts achieve the following:
- They insulate the car body from vibrations as well as possible when the vehicle is at a standstill and idling
- They prevent 'bouncing' when the vehicle is being driven on poor road surfaces
('bouncing' = 'dancing' of the engine mass on the engine mounts)
Deployment of the controllable engine mounts:
- E60: N46B20O2 (Rest of World = RoW) and N43B20O0
- E8x, E9x: N43B16O0, N43B20U0 and N43B20O0
The N43 with direct fuel injection will only be available in ACEA (ACEA: Association of European Automobile Manufacturers).
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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